i will be blunt, what is the goal of a Samurai?
protect him lord, yep... by killing the enemy. samurai spend them time to polish them technique for only one goal.... kill enemy before be killed. that why i think yoshida did think this will be better to have it into a dps. they are not knight, they are warrior that polish them blade for.... kill and only kill.

that said, we already have more than enough different tympe of tank with 2 hand. maybe time to add one dps with heavy weapon or maybe dual katana (even if it will be a ronin)